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THE GAMMA CONSTRUCTION AND ASYMPTOTIC INVARIANTS OF LINE BUNDLES OVER ARBITRARY FIELDS

Published online by Cambridge University Press:  23 September 2019

TAKUMI MURAYAMA*
Affiliation:
Department of Mathematics, Princeton University, Princeton, NJ 08544-1000, USA email [email protected]

Abstract

We extend results on asymptotic invariants of line bundles on complex projective varieties to projective varieties over arbitrary fields. To do so over imperfect fields, we prove a scheme-theoretic version of the gamma construction of Hochster and Huneke to reduce to the setting where the ground field is $F$-finite. Our main result uses the gamma construction to extend the ampleness criterion of de Fernex, Küronya, and Lazarsfeld using asymptotic cohomological functions to projective varieties over arbitrary fields, which was previously known only for complex projective varieties. We also extend Nakayama’s description of the restricted base locus to klt or strongly $F$-regular varieties over arbitrary fields.

Type
Article
Copyright
© 2019 Foundation Nagoya Mathematical Journal

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Footnotes

This material is based upon work supported by the National Science Foundation under grant nos. DMS-1501461 and DMS-1701622.

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